Change Font size and color in J2ME Program

This J2ME sample program shows how to CHANGE THE FONT SIZE and CHANGE COLOR.

Having worked with many different J2ME devices, I have come across many phones with small displays or small defaul fonts and sizes. However in real time usage, most of the times the customer needs a bigger font size. This sample J2ME code shows how to increase or change the font size according to our requirement.

/*
 *
 * A free J2ME sample program 
 * to CHANGE THE FONT SIZE of the display and CHANGE COLOR
 *
 * @author William Alexander
 * free for use as long as this comment is included 
 * in the program as it is
 * 
 * More Free Java programs available for download 
 * at http://www.java-samples.com
 *
 */
import javax.microedition.lcdui.*;
import javax.microedition.midlet.*;  
import java.io.*;
import java.lang.*;
import javax.microedition.io.*;
import javax.microedition.rms.*;

public class changeFont extends MIDlet { public static final boolean COLOR = false;
public static final boolean DEBUG = false; public static final int WHITE = 0xFFFFFF;
    public static final int BLACK = 0x000000;
    public static final int BLUE = 0x0000FF;
    public static final int LIGHT_GRAY = 0xAAAAAA;
    public static final int DARK_GRAY = 0x555555;
    
   
    private Display myDisplay = null;
    
	private DecodeCanvas decodeCanvas = null;

	private boolean painting = false;

    public changeFont() {        

        myDisplay = Display.getDisplay(this);
        decodeCanvas = new DecodeCanvas(this);

    }

 
    public void startApp() throws MIDletStateChangeException { 
        myDisplay.setCurrent(decodeCanvas);
    }


    public void pauseApp() {


    }

 
    protected void destroyApp(boolean unconditional)
            throws MIDletStateChangeException {
    }

  
    class DecodeCanvas extends Canvas {
        private changeFont parent = null;

        private int width = getWidth();
        private int height = getHeight();

     
        public DecodeCanvas(changeFont parent) {
            this.parent = parent;
     
	}
        
        public void paint(Graphics g) {
			
	
            g.setColor(WHITE);  
            g.fillRect(0, 0, width, height);
            
          
            Font f1 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_LARGE);  
            Font f2 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_MEDIUM);  
            Font f3 = Font.getFont(Font.FACE_SYSTEM, Font.STYLE_PLAIN, Font.SIZE_SMALL);  
            int yPos = 0;
            if (COLOR)
                g.setColor(BLUE);       
            else 
                g.setColor(LIGHT_GRAY);
            
				g.fillRect(0, yPos, width, f1.getHeight());

            if (COLOR)
                g.setColor(WHITE);       
            else
                g.setColor(BLACK);
			g.setFont(f1);
            g.drawString("BIG FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
			yPos = yPos + f1.getHeight() + 10;
            g.setFont(f2);
		//	 g.drawLine(0, f1.getHeight() + yPos - 1, width, f1.getHeight() + yPos - 1);
            g.drawString("MEDIUM FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
            g.setColor(BLACK);       
            //g.drawLine(0, f2.getHeight() + yPos - 1, width, f2.getHeight() + yPos - 1);
            
			yPos = yPos + f1.getHeight() + 10;            
            g.setFont(f3);
            g.drawString("SMALL FONT", 0, yPos, Graphics.LEFT | Graphics.TOP);
			yPos = yPos + f1.getHeight() + 10;            
           g.drawLine(0, f3.getHeight() + yPos - 1, width, f3.getHeight() + yPos - 1);
             
            painting = false;
        }
        
	}    
}

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